From cf7260ee89f7b187304a35b188cc0c889f7bdd24 Mon Sep 17 00:00:00 2001 From: Vlad Yasevich Date: Sat, 26 Aug 2006 02:39:03 +0200 Subject: SCTP: Reject sctp packets with broadcast addresses. Make SCTP handle broadcast properly Signed-off-by: Vlad Yasevich Signed-off-by: Sridhar Samudrala Signed-off-by: David S. Miller Signed-off-by: Adrian Bunk --- net/sctp/input.c | 3 ++- net/sctp/ipv6.c | 6 ++++-- net/sctp/protocol.c | 8 +++++++- net/sctp/socket.c | 2 +- 4 files changed, 14 insertions(+), 5 deletions(-) (limited to 'net') diff --git a/net/sctp/input.c b/net/sctp/input.c index cb78b50868ee..cf7258889128 100644 --- a/net/sctp/input.c +++ b/net/sctp/input.c @@ -169,7 +169,8 @@ int sctp_rcv(struct sk_buff *skb) * IP broadcast addresses cannot be used in an SCTP transport * address." */ - if (!af->addr_valid(&src, NULL) || !af->addr_valid(&dest, NULL)) + if (!af->addr_valid(&src, NULL, skb) || + !af->addr_valid(&dest, NULL, skb)) goto discard_it; asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport); diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 2e266129a764..c068d53e5415 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -523,7 +523,9 @@ static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) * Return 0 - If the address is a non-unicast or an illegal address. * Return 1 - If the address is a unicast. */ -static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) +static int sctp_v6_addr_valid(union sctp_addr *addr, + struct sctp_sock *sp, + const struct sk_buff *skb) { int ret = ipv6_addr_type(&addr->v6.sin6_addr); @@ -537,7 +539,7 @@ static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) if (sp && ipv6_only_sock(sctp_opt2sk(sp))) return 0; sctp_v6_map_v4(addr); - return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp); + return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); } /* Is this a non-unicast address */ diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index de693b43c8ea..1ebc274a1068 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -365,12 +365,18 @@ static int sctp_v4_is_any(const union sctp_addr *addr) * Return 0 - If the address is a non-unicast or an illegal address. * Return 1 - If the address is a unicast. */ -static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) +static int sctp_v4_addr_valid(union sctp_addr *addr, + struct sctp_sock *sp, + const struct sk_buff *skb) { /* Is this a non-unicast address or a unusable SCTP address? */ if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr)) return 0; + /* Is this a broadcast address? */ + if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST) + return 0; + return 1; } diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 0f0ef2d87434..42a22355e027 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -172,7 +172,7 @@ static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr, return -EINVAL; /* Is this a valid SCTP address? */ - if (!af->addr_valid(addr, sctp_sk(sk))) + if (!af->addr_valid(addr, sctp_sk(sk), NULL)) return -EINVAL; if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr))) -- cgit v1.2.3